«comScore Releases '2013 UK Digital Future in Focus Report,'»comScore.com, February 14, 2013.
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Josh Holiday, «Google Pledge to Downgrade Piracy Sites Under Review,» Guardian, November 5, 2012.
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See Glenn Peoples, «RIAA Report Criticizes Google's Efforts to Limit Infringing Search Results,» Billboard, February 21, 2013. Also Glenn Peoples, «Business Matters: MP3 Stores Harder to Find as Google Search Removal Requests Accumulate,» Billboard, February 4, 2013.